exhibit402

active

Proof of publication: permanently prove what a URL served at a moment in time. Two independent observers on different networks capture your URL at the same frozen instant; matching captures are CERTIFIED, the evidence is stored permanently, and an ERC-721 certificate carrying every observer hash is minted to the wallet that paid.

Chain infraBasex402 v2exactexhibit402.dylan-caponi.workers.dev ↗︎

Settled via Coinbase.

Transactions · 30d
1
Volume · 30d
$0.02
Unique buyers · 30d
1
Uptime · 30d
66.7%
Latency p50
478ms
Reported calls · 30d
3

Endpoints (3 live)

  • GET /verify — Re-verify any exhibit402 proof-of-publication certificate for $0.02. Pass id = ERC-721 token id, Arweave tx id, or job id. The service re-downloads the permanently stored screenshot and signed manifest, recomputes every SHA-256, and checks them against the manifest and the on-chain record (immutable screenshotSha256, tokenURI, owner). Returns a machine-readable verdict with per-check detail, so an agent can confirm a certificate is genuine without trusting the issuer. (0.02 USDC on Base)
  • POST /capture — Prove what a web page showed: verify completed work, freeze evidence for a dispute, certify a page before you rely on it. Two independent observers on separate networks capture your URL at one frozen instant: byte-identical is CERTIFIED; disagreement is WITNESSED with pixel agreement and diff map. Signed manifest, RFC 3161 timestamp, permanent Arweave storage; ERC-721 certificate minted to the paying wallet. $1.00 fullpage, $0.50 viewport. Free claim polling. Rejects refund minus $0.10. (1 USDC on Base)
  • GET /capture (free)

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